package ch09;

class _13_StringEx5 {
	static String s;
	static String s2 = "";

	public static void main(String[] args) {
		for (int i = 1; i < 10; i++) {
			s += i;
			s2 += i;
		}

		System.out.println(s); // null123456789
		System.out.println(s2); // 123456789		
	}
}